National Baseball League

The National Baseball League (NBL) is an amateur baseball league organised by the British Baseball Federation (BBF). The league is the top level of baseball in the United Kingdom, with the league champions also being named the overall National Champion in the United Kingdom. There is no official system of Promotion-and-Relegation; however several teams have moved up and down the structure freely.

Teams
The NBL has fluctuated in size, with multiple teams joining and subsequently leaving. The BBF also allows multiple teams to come from the same club, as evident with the London Mets and Capitals both drawing from the same pool of players (although there are restrictions on players from a club playing with multiple teams in the same season).